Fics like Excess Serum

There's a good reason new medication has to undergo strenuous clinical trials. For example, a serum designed to aid regeneration could cause someone to start to overproduce cum, which might have other knock-on effects. Unfortunately for Jack, he's a trusting sort, so when his friend Helen asks him to help test her newest creation, he agrees. Fortunately for Jack, Helen is a good friend, who is willing... even eager to help deal with his unexpected condition.

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